Port to new connect api

Change-Id: I84834f37dd15108ed8c5fbf5353bcabc4e564f70
Reviewed-by: hjk <hjk@theqtcompany.com>
Reviewed-by: Christian Kandeler <christian.kandeler@theqtcompany.com>

src/libs/ssh/sshconnectionmanager.cpp

@@ -122,7 +122,8 @@ public:
 
         // create a new connection:
         SshConnection * const connection = new SshConnection(sshParams);
-        connect(connection, SIGNAL(disconnected()), this, SLOT(cleanup()));
+        connect(connection, &SshConnection::disconnected,
+                this, &SshConnectionManager::cleanup);
         m_acquiredConnections.append(connection);
 
         return connection;